US Secretary of State Mike Pompeo arrived in Pyongyang on Friday to press the government on its promises, after reports that North Korea had not only continued but stepped up its nuclear production following June's summit.
At least, that's what appears to be the reason behind a gift Trump is reportedly giving Kim, to be delivered via Secretary of State Mike Pompeo while he's in North Korea this week: a CD with Elton John's song "Rocket Man", per the Chosun Ilbo's sources.
The two sides will meet again on Saturday morning at 9 a.m.in Pyongyang, although it's unclear if Pompeo will meet with Kim Jong Un, as he has on his previous two visits.
He downplayed concerns that improved relations will be accompanied by the easing of sanctions and pressure on North Korea, saying that the progress in inter-Korean projects will depend on whether appropriate conditions are created.
Choi Kang, vice-president of Seoul's Asan Institute for Policy Studies, said Trump's window to lock North Korea into a genuine denuclearization process may close as early as November if his Republican Party loses congressional elections, reducing the administration's political leverage.
Speaking on Thursday, Mr Trump told reporters aboard Air Force One on a trip to Montana that he was still upbeat about the future of North Korea and his relationship with its leader.
North Korea is believed to be constructing an operational nuclear-armed ballistic missile submarine, and US intelligence officials believe the rogue regime is deliberately "deceiving" Washington - even as Pyongyang says it seeks peace and denuclearization.
North Korea could also deliver the remains of some American soldiers killed in the 1950-53 Korean War.
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The real impact of the Chemical Material Institute's expansion depends on any agreements Trump and Kim may have reached at their June summit in Singapore.
Both issues are considered essential tests of whether Kim is serious about negotiations.
Last Saturday, The Washington Post, citing US intelligence officials, said the North was working to hide its nuclear weapons and delivery systems.
He said relations between the USA and North Korea have "dramatically shifted" in North Korea's favor over the past few months.
Over the past quarter-century, North Korea has frustrated or outfoxed US administrations that have attempted to stop and reverse its weapons development through diplomacy and sanctions.
Trump's national security adviser, John Bolton, says North Korea could dismantle its nuclear arsenal within a year, but other US officials have said they hope it can be accomplished by the end of Trump's first term in the White House, in January 2021. "We are watching closely". He is due to meet officials from allies South Korea and Japan in Tokyo also on Sunday.
A spokesman for South Korea's presidential office would only say South Korea and the United States were working to formulate "constructive measures" on North Korea's denuclearisation.